·2,447,543篇论文数据，部分数据来源于NoteExpress
30多个种类，零件精度与复杂程度都达到发达国家先进水平，满足进口零件国产化的要求。
About 30 sorts, the accuracy and complexity belong to the high level of developed countries, which meet the requirements of localization for import parts.
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